SAWYER_EXPORT std::string
Grammar::evalArgument(TokenStream &tokens, ErrorLocation &eloc, bool requireRight) const {
std::string retval, data;
size_t depth = 0;
while (!tokens.atEof()) {
if (tokens.isa(TOK_LEFT)) {
++depth;
retval += tokens.lexeme();
tokens.consume();
} else if (tokens.isa(TOK_RIGHT)) {
if (0 == depth)
break;
--depth;
retval += tokens.lexeme();
tokens.consume();
} else if (tokens.isa(TOK_FUNCTION)) {
retval += evalFunction(tokens, eloc);
} else {
retval += tokens.lexeme();
tokens.consume();
}
}
if (requireRight) {
if (!tokens.isa(TOK_RIGHT))
throw SyntaxError("end-of-argument expected");
tokens.consume();
}
if (depth > 0)
throw SyntaxError("expected end-of-argument marker");
return retval;
}
SAWYER_EXPORT std::string
Grammar::eval(TokenStream &tokens, ErrorLocation &eloc) const {
std::string retval;
while (!tokens.atEof()) {
retval += evalArgument(tokens, eloc, LEAVE);
if (tokens.isa(TOK_RIGHT))
throw SyntaxError("unexpected end-of-argument");
}
return retval;
}
SAWYER_EXPORT std::string
Grammar::readArgument(TokenStream &tokens, ErrorLocation &eloc, bool requireRight) const {
std::string retval;
size_t depth = 0;
for (/*void*/; !tokens.atEof(); tokens.consume()) {
if (tokens.isa(TOK_LEFT)) {
++depth;
} else if (tokens.isa(TOK_RIGHT)) {
if (0 == depth)
break;
--depth;
}
retval += tokens.lexeme();
}
if (requireRight) {
if (!tokens.isa(TOK_RIGHT))
throw SyntaxError("end-of-argument expected");
tokens.consume();
}
if (depth > 0)
throw SyntaxError("expected end-of-argument marker");
return retval;
}